Folks, if this is an established design (been around for a while) the thrust angles and incidences have probably been adequately worked out at the factory. FIVESQUARE, you, I believe, have the right idea.

My belief is that the plane is a tad nose heavy. When trimming out a nose heavy airplane, you must add elevator trim to keep it flying level at 1/3 to 1/2 throttle. As soon as you throw the petal to the metal the trim settings at the lower throttle settings magnify the tail-down forces and the nose will come up.

Technically, it works like this:
If an airplane is balanced perfectly (the center of pressure (CP) and the center of gravity (CG) will in the same spot. In a slightly nose heavy condition the CG will be located slightly forward of the CP. This nose-heavy condition contributes to the pitching moment (desire for the plane to pitch forward about the center of pressure) and must be counteracted by downforce (up elevator trim) on the tail of the airplane. The condition just described is what THE CROW is experiencing at half throttle. As he increases the speed (opens up to full throttle) the main wing lift and tail section down forces increase, but the pitching moment does not (the nose weight does not increase). This imbalance causes the airplane to nose up.

My advice to you (THE CROW) is to recheck the balance. This type of airplane is best flown (for stability reasons) slightly nose heavy (min. of 1/4" ahead of the neutral CG point). The next time you take the plane up, trim it out at full throttle, not half throttle.

I would like to continue, but somebody just threw a frying pan at me. Gotta go...........AHHHHHHHHHHHHHHHHHH

Weldo